US measurements though to be honest it does not matter.
INGREDIENTS:
* 2 cups all-purpose flour (I use plain flour here)
* 2 1/2 teaspoons baking powder (chuck in a bit more in the UK)
* 1/2 teaspoon salt
* 1 egg, slightly beaten
* 1 1/2 cups milk
* 2 tablespoons melted butter
PREPARATION:
Sift together flour, baking powder, and salt. In a separate bowl, combine egg and milk; add to flour mixture, stirring only until smooth. Blend in melted butter. Cook on a hot, greased griddle, using about 1/4 cup of batter for each pancake. Cook until brown on one side and around edge or the little bubbles start to burst; turn and brown the other side.
To be honest what you have to do it play it by ear a bit. If you like eggy pancakes add two eggs. If you like them thinner add more milk. Another trick is to separate the egg whites and beat them until fluffy and in peaks, then add them to the batter slowly. This makes for even fluffier pancakes, but is not a necesary step.
You can chuck in choco chips, fruit too...
Some Pancake box mixes contain a small amount of cornflour/cornmeal so you can add a bit to your own recipe.